Matter setting CarbonDioxideConcentrationMeasurement value.

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

Dhaval Dalvadi — Thu, 03 Apr 2025 12:01:14 GMT

Hi filipmrazek
Can you provide complete steps to resolve this issue ?
We are also trying to add Carbon Dioxide cluster but failed to set or get measured value. we tried above steps but it seems we are missing something

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

filipmrazek — Wed, 05 Jun 2024 05:54:09 GMT

Hi Maria,

Thank you for sour response. I looked at the section you found and I found the problem. I had to add `

emberAfEndpointConfigure()` before `emberAfContainsServer(mEndpointId, mClusterId)`.
Now it works. Thanks for your help.

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

Maria Gilje — Fri, 31 May 2024 15:12:26 GMT

Hi Filip,

Yes, I see it now that you are using the constructor with four arguments. Apologies for the misunderstanding, you are correct and I was wrong in my previous reply.

[quote user="filipmrazek"]However, I figured out that the Init() function returns `CHIP_ERROR_INCORRECT_STATE`, but cannot find out why.[/quote]

Alright, so the functions which can cause CHIP_ERROR_INCORRECT_STATE to be returned are IsValidAliasCluster(), emberAfContainsServer(), and registerAttributeAccessOverride() (https://github.com/nrfconnect/sdk-connectedhomeip/blob/v2.6.1/src/app/clusters/concentration-measurement-server/concentration-measurement-server.h#L350-L356). So the next step would be to find our the source for the error amongst those three functions.

Best regards,

Maria

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

filipmrazek — Thu, 30 May 2024 11:21:27 GMT

Hi Maria,

I'm not sure if I understand, but in the post I shared on May 15th I use the correct constructor with 4 arguments and the last one is measurement unit. In the post I used: `ConcentrationMeasurement::MeasurementUnitEnum::kPpm`.

However, I figured out that the Init() function returns `CHIP_ERROR_INCORRECT_STATE`, but cannot find out why.

Ad MinMax constrain - I didn't set any MinValue or MaxValue, so they are Null and the function you suggested returns always true if they are Null

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

Maria Gilje — Wed, 29 May 2024 13:55:31 GMT

Hi Filip,

Regarding your implementation you shared on May 15th:

The constructor you used is meant to be used when the kNumericMeasurement feature is not used. If you are using kNumericMeasurement you need to use the other Instance constructor.

If you are not using kNumericMeasurement, you can check if the Init() function returns an error code.

If both steps above are ok, the cases where SetMeasuredValue will not update the MeasuredValue attribute is when the input is the same as the current value or if the input value exceeds the limits for MeasuredValue (CheckConstraintMinMax).

Best regards,

Maria

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

filipmrazek — Sun, 26 May 2024 18:06:03 GMT

Hi Maria,

Thank you for your update.
I tried to impelemnt Set function for sending MeasuredValue for CarbonDioxide cluster the same way as for Temperature measurement. here is the implemented function:

EmberAfStatus Set(chip::EndpointId endpoint, float value)
{
    using Traits = NumericAttributeTraits<float>;
    if (!Traits::CanRepresentValue(true, value))
    {
        return EMBER_ZCL_STATUS_CONSTRAINT_ERROR;
    }
    Traits::StorageType storageValue;
    Traits::WorkingToStorage(value, storageValue);
    uint8_t* writable = Traits::ToAttributeStoreRepresentation(storageValue);
    return emberAfWriteAttribute(endpoint, Clusters::CarbonDioxideConcentrationMeasurement::Id, Id, writable, ZCL_SINGLE_ATTRIBUTE_TYPE);
}

but the return value is EMBER_ZCL_STATUS_FAILURE. I'm not sure, but it looks like its returning the value from this line https://github.com/project-chip/connectedhomeip/blob/3718e996b56f36a553c1b4571f77728396590776/src/app/util/attribute-storage.cpp#L656.

I noticed one interesting thing. In zap tool, The Storage option for MeasuredValue of CarbonDioxide measurement is grayed out and I cannot change that to RAM.

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

Maria Gilje — Fri, 24 May 2024 15:13:27 GMT

Hi Filip,

Thank you for your patience.

When I returned to this case today, I made sure to read the Matter specification along with it, and I found that the CarbonDioxideConcentrationMeasurement cluster should be more similar to the RelativeHumidityMeasurement you shared as an example. Neither cluster has write access for their MeasuredValue attribute, yet you are able to use Set on the Relative Humidity.

I will contact the developers about this so we can find out what the proper functionality is.

Best regards,

Maria

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

filipmrazek — Wed, 22 May 2024 06:08:22 GMT

Hi,

did anybody have a time to take a look at my problem with settng measured data? I investigate it a little bit and I find out that it logs the following to the console at startup:

<err> chip: [DMG]Endpoint 1, Cluster 0x0000_040D not found in IncreaseClusterDataVersion!

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

filipmrazek — Wed, 15 May 2024 06:10:14 GMT

Hello Maria,

First of all, thank you for your answer. I tried to change my code according to the example you sent. My code looks something like that:

in header file:
ConcentrationMeasurement::Instance<true, true, true, true, true, true> co2_cluster;

in source file constructor:
Constructor::Constructor()
    : co2_cluster(1, 
        CarbonDioxideConcentrationMeasurement::Id, 
        ConcentrationMeasurement::MeasurementMediumEnum::kAir,
        ConcentrationMeasurement::MeasurementUnitEnum::kPpm)
{
    co2_cluster.Init();
}

void send_data(float value)
{
    co2_cluster.SetMeasuredValue(DataModel::Nullable<float>(value));
    LOG_INF("data sent");
}

The code compiles, but if I try it, the CO2 value is missing. (I'm trying it with python matter server). On the other hand, I can see all other values (like temperature, humidity) which were send with the following code.

Clusters::RelativeHumidityMeasurement::Attributes::MeasuredValue::Set(1, value);

Am I missing something in the example?

RE: Matter setting CarbonDioxideConcentrationMeasurement value.

Maria Gilje — Tue, 14 May 2024 14:07:46 GMT

Hi Filip,

To change the value for the MeasuredValue attribute for the CarbonDioxideConcentrationMeasurement cluster (and similar), you need to use SetMeasuredValue. You can see a usage example in air-quality-sensor-manager.cpp.

Best regards,

Maria